University Park, Pa. — Penn State's landmark elm trees are in danger of disappearing. Elm yellows disease, a deadly bacteria-like infection for which there is no known cure, already has infected more than 15 percent of the approximately 290 trees at University Park.

A Web site celebrating the tradition, beauty and history of the elms — and explaining the impact of elm yellows — offers photos, videos and other information at http://elmyellows.psu.edu.

Visitors to the site are invited and encouraged to post comments, such as reactions to the site's content and memories about the landmark trees.

Roger Williams, executive director of the Penn State Alumni Association, is interviewed in one video on the topic, "What Penn State Elms Mean to Alumni." You may view and offer a comment here.